CRZEE - Extended Abstracts

Research activities and possibilities at Ottenby Bird Observatory

Martin Stervander, warden

Ottenby Bird Observatory, P. O. Box 1500, SE-380 65 Degerhamn, Sweden. E-mail: ottenby@post.utfors.se. Webpage: www.sofnet.org/ofstn/noframes.htm.

Background
At northern latitudes in Europe and Asia, where the climate has strong seasonal changes, a large proportion of the avian fauna migrate southwards in the autumn and spend the non-breeding season in winter quarters in southern Europe or Africa. Juvenile birds have to find the right way to the winter quarters despite the fact that they have never been there before. The orientation of migrating birds is therefore well studied, yet still we do not fully understand it. However, we do know that the birds use the stars and the sun for navigation, that they sense the spatially different inclination angle of the magnetic field of the earth and that they use visible geographical guidelines (Alerstam 1990). Such guidelines typically consist of mountains ranges and coastlines (Alerstam 1990).

Ottenby is situated at the southernmost point of Öland, an island off the south-eastern coast of Sweden (Fig. 1). Due to its geographical situation, Ottenby attracts large numbers of migrating birds. The area is known for its birds since 1741, when Carl von Linnaeus paid a visit during one of his trips (Linnaeus 1745). The bird fauna at Ottenby was later described by Meves (1968), and during the end of the 19th century, his apprentice Gustaf Kolthoff was the first to describe the sex- and age-dependent timing of wader migration (Kolthoff 1896).

After initial expeditions in 1937 and 1938 by Gunnar Svärdsson and Ulf Bergström (Bergström & Svärdsson 1938, 1939), Ottenby Bird Observatory was founded in 1946 by the Swedish Ornithological Society (Danielsson et al. 1947). Ever since, the bird observatory has been run by the Swedish Ornithological Society, nowadays through a scientific, executive board. Presently, one warden supervises 4-12 volunteers every year from March through November.

Figure 1. The location of Ottenby (56°12' N, 16°24' E) indicated by a red dot.

Basic activities
The activities at Ottenby Bird Observatory can be divided into some major projects:

Monitoring. Locally breeding bird populations as well as migrating bird populations are monitored at Ottenby. Every spring and summer Ottenby Bird Observatory carries out several detailed surveys of breeding birds, providing important data for local bird conservation. For example an annual long-term survey has been carried out in the deciduous woods of Ottenby lund since 1972 (Hjort 1988), the vast wetlands are investigated regularly (e.g. Pettersson 2001) and the gull colony is monitored yearly. Day-migrating birds are monitored by detailed recording of observations (Edelstam 1972) and both diurnal and nocturnal migrants on stopover are monitored through the ringing (e.g. Andersson et al. 2002; se below).

Figure 2. The declining ringing figures of the long-distance migrant Eurasian Wryneck Jynx torquilla, which reflect a declining population trend.

Information. Ottenby is a well-known tourist attraction (thanks to the birds and to "Långe Jan", the tallest lighthouse in Sweden). In recent years, 120,000-150,000 persons have visited the location every year. They have been greeted by the staff of Ottenby Naturum, the nature information centre, in close cooperation with Ottenby Bird Observatory. The bird observatory offers guided tours to c. 3,500 persons per year, the groups consisting of all from school classes to company groups. Ottenby Bird Observatory also often appears in media, in 2003 well over 100 times.

Research. The main reason to start Ottenby Bird Observatory was to carry out scientific ringing of migrating birds and this is still the framework in our activities. During the unbroken succession of ringing from the start in 1946, c. 900,000 birds of c. 250 species have been ringed (see Appendix 1 for more detailed information). This is the longest unbroken ringing series in the world. But why ring these birds? I present three main fields of use.

The aim of bird ringing
1) Where are the breeding grounds, where are the wintering areas, and what age do the birds reach?
Due to recoveries of ringed birds, we have information of the origin, the migration routes and the wintering grounds for most - but not all - of the bird species breeding in Sweden (e.g. Roos 1984, Liljefors et al. 1985, Pettersson et al. 1986, Fransson & Pettersson 2001). For some of these species, those ringed in sufficient numbers, we have also data on survival rate, mean age and highest age. Very roughly, c. 80 % of the juvenile passerines die during their first year of life. Survivors of the first critical year, where the juvenile has to migrate through unknown land back and forth to wintering grounds, have much higher survival in the future and can live for several years. Generally, the average life span increases with the mean size of the species. The oldest wild bird known is a Manx shearwater Puffinus puffinus (http://news.bbc.co.uk/2/hi/science/nature/1937033.stm) in Britain, which was controlled at the ringing site in 2002 at an age of 52 years. At Ottenby, the record is presently held by an Eider Somateria mollissima that was ringed in 1950 and found dead 26 years later in 1976.

2) Monitoring bird populations
The trapping area in the observatory garden is c. 1.2 hectares and contains most of the higher vegetation within the nearest 2 km. It is surrounded by water on three sides and by grazed meadows to the north. Hence, during the migration period, the garden attracts large numbers of shrub- and woodland birds.

Birds have been caught in funnel traps of Helgoland-type (Bub 1991) since the first year of trapping in 1946, and by mist nets since 1959. Since 1972 the number of nets and traps, their position, and the use of them, have been strictly standardised. Furthermore, the garden has been maintained in the same shape over the years. Thereby, the circumstances affecting between-year trapping numbers have been minimised.

This means that we can follow the fluctuations in different bird populations and discern long-term trends. Rapid changes in the populations are often detected immediately in the ringing numbers. The standardised bird ringing at Ottenby Bird Observatory has since 1980 been a part of the Coordinated Environmental Monitoring in Sweden (http://www.naturvardsverket.se/dokument/mo/modok/export/nymoeng.pdf) carried out by the Swedish Environmental Protection Agency.

Over the years, long-term trends for many species have emerged. Generally, long-distance migrants (migrating to tropical Africa or Asia) are declining as are the birds breeding in agricultural habitats. As an example, see Fig. 2.

Figure 3. The ringing of a bird. A lightweight metal ring is applied around the tarsus.

3) High quality data collection
All the birds that are trapped are provided with a lightweight metal ring around the tarsus (the longest part of the leg, actually the foot), see Fig. 3. Each ring has a unique ring number and the address to the Swedish Bird Ringing Centre at the Swedish Museum of Natural History, which administrates ringing and recoveries. The ring has a loose fit and does not affect the bird. All birds are determined to species and, as far as possible, to sex and age. A number of morphometric information is collected from all birds. The wing length is measured (mainly as a size measurement; Fig. 4) and the body mass (indicating the condition) is registered with an electronic scale. As a measurement of condition, the amount of visible fat that is stored on the under parts of the bird's body is scored according to a special scale. Fat is the main "fuel" used by birds for flying, as it is highly energy-rich and does not bind water when stored. Fat deposits are built up through intensive foraging during stopover (e.g. Alerstam 1990). Also, the moult is recorded for birds in the process of renewing their wing or body feathers. In addition to these basic measurements, many others arein use for specific groups of species, time periods or age classes. The very same procedure - except the ringing - is undertaken when retrapping an already ringed bird (of our own or from another ringing site).

Figure 4. Recording morphometrics. The wing length is measured.

Scientific research at Ottenby Bird Observatory
Traditionally, ecology has been the main field of scientific research at Ottenby Bird Observatory. Over the years several studies of migration and stopover ecology, bird orientation, moult, and breeding ecology have been carried out at the observatory. The publication list (see Appendix 2) contains nearly 200 contributions in scientific journals.

In recent years, a new research field has become progressively more important at Ottenby Bird Observatory. During the years 1999-2002, we have focussed hard efforts on studies regarding zoonoses. For instance, we have collected and delivered c. 10,000 samples of blood, feathers, faeces, ticks etc. In 2003 solely, the bird observatory has collected more than 5,000 samples. This research is, in most cases, closely connected to the Research Institute for Zoonotic Ecology and Epidemiology (RIZEE), Öland, Sweden. The samples collected are used in numerous projects on zoonoses, e.g. influenza A (see e.g. Fouchier et al. 2003), Campylobacter (see e.g. Waldenström et al. 2002a), Salmonella (see e.g. Hernandez et al. 2003) and tick-borne diseases, but also in projects on blood parasites or antibiotic resistance in bacteria.

The quality of the sample material from Ottenby Bird Observatory is, undoubtedly, outstanding. All samples are accounted for along with the information of the unique individual sampled from the exact sampling occasion. Owing to the large recovery material (see Fig. 5) of birds ringed at Ottenby Bird Observatory, we also have extensive background information of the distribution of the populations studied, i.e. we know the origin and destination of the birds trapped. From the large biometric dataset we can also draw conclusions of the migration ecology of the different species/populations studied (see e.g. Pettersson et al. 1990).

The Mallard Anas platyrhynchos could serve as a good example, a species that along with other ducks is caught in a special trap. The trapping in the duck decoy was run in 1962-1984, but reactivated in 2002. C. 8,000 faecal samples from c. 1,800 Mallards (in total trapped or retrapped 3,400 times), collected from October 2002 to October 2003, have been used in studies of e.g. influenza A, Campylobacter, Salmonella, entero viruses, and bacteria with extended antibiotic resistance. By combining the test results with the information from over 1,700 recoveries of Mallards (see Fig. 6), we could possibly map out different influenza subtypes or patterns of antibiotic resistance from different populations of birds.

Figure 5. The recoveries of birds ringed at Ottenby comprises more than 10,000 records

Foreign activities
Birds pay no attention to national borders. Therefore Ottenby Bird Observatory carries out research activities also in other parts of the world. Presently, the bird observatory is focussing on the "central flyway" - from Scandinavia through central Europe and central Mediterranean to tropical Africa and back. This is achieved through activities on Capri, Italy (where Ottenby Bird Observatory has been operating since the 1950's), and in Nigeria, Africa (where the activity started in 1999, see Ottosson et al. 2001). Among many other things studied there are the winter ecology and phenology of Palaearctic migrants (e.g. Ottosson et al. 2003) and the spreading of blood parasites (e.g. Plasmodium and Haemoproteus) from resident African species through different vectors to Palaearctic migrants transporting the blood parasites back to Europe (Waldenström et al. 2002b). From recent expeditions in Nigeria and Kazakhstan, samples have also been collected for analysis of e.g. influenza A.

Concluding remarks
Thus, there are many ongoing research activities at Ottenby Bird Observatory and even more research possibilities. Ottenby Bird Observatory is, for the outstanding material and quality, unquestionably one of the foremost bird observatories in the world. For a detailed list of possible project species, see Appendix 1, where are given the total ringing figures and the yearly occurrence for the most regularly caught birds. If interested in cooperation with Ottenby Bird Observatory, see Appendix 3 for contact options.

Acknowledgwments - I am grateful to Linus Hedh, who assisted in investigating old Ottenby references. Jonas Waldenström and Björn Olsen gave valuable comments on an earlier version of the manuscript, in which Spoke Wintersparv improved the language.

Figure 6. Some of the recoveries of Mallards Anas platyrhynchos ringed at Ottenby and found in winter (December–February; blue squares) and summer (June–August; red circles) respectively.

Appendix 1.

Species

Total number ringed

Mute Swan Cygnus olor

18

+

Barnacle Goose Branta lecopsis

10

+

Brent Goose Branta bernicla

31

+

Common Shelduck Tadorna tadorna

900

**

Eurasian Wigeon Anas penelope

215

*

Gadwall Anas strepera

100

Eurasian Teal Anas crecca

2 600

**

Mallard Anas platyrhynchos

12 000

***

Northern Pintail Anas acuta

415

*

Tufted Duck Aythya fuligula

500

+

Common Eider Somateria mollissima

700

+

Northern Goshawk Accipiter gentilis

125

Eurasian Sparrowhawk Accipiter nisus

1 731

*

Common Buzzard Buteo buteo

200

Rough-legged Buzzard Buteo lagopus

615

Eurasian Oystercatcher Haematopus ostralegus

850

+

Little Plover Charadrius dubius

132

+

Ringed Plover Charadrius hiaticula

7 676

**

Grey Plover Pluvialis squatarola

146

+

Northern Lapwing Vanellus vanellus

1 190

+

Red Knot Calidris canutus

3 024

*

Sanderling Calidris alba

105

Little Stint Calidris minuta

4 691

*

Temminck's Stint Calidris temminkii

633

+

Curlew Sandpiper Calidris ferruginea

5 357

*

Dunlin Calidris alpina

131 400

***

Broad-billed Sandpiper Limicola falcinellus

485

Ruff Philomachus pugnax

6 800

*

Jack Snipe Lymnocryptes minimus

183

+

Common Snipe Gallinago gallinago

900

*

Eurasian Woodcock Scolopax rusticola

145

Bar-tailed Godwit Limosa lapponica

356

Common Redshank Tringa totanus

6 250

*

Green Sandpiper Tringa ochropus

300

+

Wood Sandpiper Tringa glareola

13 221

**

Common Sandpiper Actitis hypoleucus

4 747

**

Ruddy Turnstone Arenaria interpres

1 620

*

Black-headed Gull Larus ridibundus

1 500

+

Mew Gull Larus canus

855

+

Herring Gull Larus argentatus

160

+

Great Black-backede Gull Larus marinus

30

+

Common Cuckoo Cuculus canorus

274

+

Long-eared Owl Asio otus

1 505

*

Tengmalm's Owl Aegolius funereus

367

European Nightjar Caprimulgus europaeus

187

Common Swift Apus apus

2 549

Eurasian Wryneck Jynx torquilla

828

+

Green Woodpecker Picus viridus

104

Great Spotted Woodpecker Dendrocopus major

989

*

Sky Lark Alauda arvensis

401

Sand Martin Riparia riparia

216

Barn Swallow Hirundo rustica

2 204

*

House Martin Delichon urbica

3 920

**

Tree Pipit Anthus trivialis

3 882

**

Meadow Pipit Anthus pratensis

3 175

*

Red-throated Pipit Anthus cervinus

353

Rock Pipit Anthus petrosus

2 630

Yellow Wagtail Motacilla flava

3 586

**

White Wagtail Motacilla a. alba

14 866

**

Bohemian Waxwing Bombycilla garrulus

181

Winter Wren Troglodytes troglodytes

8 257

**

Hedge Accentor Prunella modularis

5 138

**

European Robin Erithacus rubecula

183 887

***

Thrush Nightingale Luscinia luscinia

2 316

*

Bluethroat Luscinia svecica

2 220

*

Black Redstart Phoenicurus ochrurus

719

+

Common Redstart Phoenicurus phoenicurus

26 900

**

Whinchat Saxicola rubetra

979

+

Northern Wheatear Oenanthe oenanthe

1 660

*

Common Blackbird Turdus merula

9 971

**

Fieldfare Turdus pilaris

769

+

Song Thrush Turdus philomelus

19 173

**

Redwing Turdus iliacus

3 350

**

Mistle Thrush Turdus viscivorus

104

Common Grasshopper Warbler Locustella naevia

184

Sedge Warbler Acrocephalus schoenobaenus

2 699

**

Marsh Warbler Acrocephalus palustris

1 181

*

Eurasian Reed Warbler Acrocephalus scirpaceus

1 919

*

Icterine Warbler Hippolais icterina

4 534

**

Barred Warbler Sylvia nisoria

787

+

Lesser Whitethroat Sylvia curruca

21 053

**

Common Whitethroat Sylvia communis

13 870

**

Garden Warbler Sylvia borin

9 374

**

Blackcap Sylvia atricapilla

5 807

**

Wood Warbler Phylloscopus sibilatrix

3 112

**

Common Chiffchaff Phylloscopus collybita

4 575

**

Willow Warbler Phylloscopus trochilus

87 744

***

Goldcrest Regulus regulus

84 764

***

Spotted Flycatcher Muscicapa striata

9 047

**

Red-breasted Flycatcher Ficedula parva

826

+

Collared Flycatcher Ficedula albicollis

126

+

Pied Flycatcher Ficedula hypoleuca

9 194

**

Long-tailed Tit Aegithalos caudatus

1 195

+

Coal Tit Parus ater

839

Blue Tit Parus caeruleus

11 704

**

Great Tit Parus major

10 398

**

Eurasian Treecreeper Certhia familiaris

2 100

*

Red-backed Shrike Lanius collurio

12 156

**

Great Grey Shrike Lanius excubitor

361

Eurasian Common Jay Garrulus glandarius

147

Eurasian Jackdaw Corvus monedula

103

+

Common Starling Sturnus vulgaris

26 092

**

House Sparrow Passer domesticus

958

+

Eurasian Tree Sparow Passer montanus

3 484

*

Chaffinch Fringilla coelebs

10 949

**

Brambling Fringilla montifringilla

2 606

*

European Greenfinch Carduelis chloris

7 574

**

European Goldfinch Carduelis carduelis

622

+

Eurasian Siskin Carduelis spinus

4 362

**

Common Linnet Carduelis cannabina

2 698

**

Twite Carduelis flavirostris

644

Mealy Redpoll Carduelis flammea

5 965

**

Arctic Redpoll Carduelis hornemanni

107

Common Crossbill Loxia curvirostra

319

Common Rose Finch Carpodacus erythrinus

635

+

Common Bullfinch Pyrrhula pyrrhula

3 985

*

Hawfinch Coccothraustes coccothraustes

138

+

Snow Bunting Plectrophenax nivalis

198

Yellowhammer Emberiza citrinella

7 799

**

Ortolan Bunting Emberiza hortulana

587

+

Reed Bunting Emberiza schoeniclus

4 123

**

Appendix 2. Contributions from Ottenby Bird Observatory.
1. Danielsson, G., Edelstam, C. & Svärdson, G. 1947. Ottenby fågelstation, dess tillkomst och verksamhet år 1946. Vår Fågelvärld 6, 38-51. [The Ornithological station of Ottenby. First report.: In Swedish with English summary.]
2. Svärdson, G. 1948. Verksamheten vid Ottenby fågelstation 1947. Vår Fågelvärld 7, 25-44. [Ottenby Bird Station, second report, for the season 1947: In Swedish with English summary.]
3. Bergman, G. 1948. Sträck, återflygning och övernattning hos sädesärlan (Motacilla a. alba L.) under hösten vid Ölands södra udde. Vår Fågelvärld 7, 57-67. [In Swedish with English summary.]
4. Svärdson, G. 1949. Skruvflykt hos flyttande måsar. Vår Fågelvärld 8, 13-33. [Gyration performed by migrating gulls: In Swedish with English summary.]
5. Svärdson, G. 1949. Verksamheten vid Ottenby fågelstation 1948. Vår Fågelvärld 8, 97-120. [The activities of the ornithological station at Ottenby in 1948: In Swedish with English summary.]
6. Svärdson, G. 1950. Verksamheten vid Ottenby fågelstation 1949. Vår Fågelvärld 9, 11-33. [The activities of the ornithological station at Ottenby in 1949: In Swedish with English summary.]
7. Svärdson, G. 1951. Verksamheten vid Ottenby fågelstation 1950. Vår Fågelvärld 10, 97-124. [The activities of the ornithological station at Ottenby in 1950: In Swedish with English summary.]
8. Edelstam, C. 1951. The Ottenby Bird Station. Proceedings. Xth International Ornithological Congress, Uppsala, pp. 295-309.
9. Hylbom, R. 1951. Migration period of some passerines revealed by daily ringing figures at Ottenby. Proceedings. Xth International Ornithological Congress, Uppsala, pp. 210-316.
10. Svärdson, G. 1951. Swift (Apus apus) movements in summer. Proceedings. Xth International Ornithological Congress, Uppsala, pp. 335-338.
11. Broberg, L. 1952. Rödhuvade törnskatan (Lanius senator, L.) funnen på Öland. Vår Fågelvärld 11, 97-101. [First record of Lanius senator for Sweden: In Swedish with English summary.]
12. Gillin, R. 1952. Emberiza melanocephala, Scop., en för Sverige ny fågel. Vår Fågelvärld 11, 114-116. [First record for Sweden of Emberiza melanocephala: In Swedish with English summary.]
13. Svärdson, G. 1952. Verksamheten vid Ottenby fågelstation 1951. Vår Fågelvärld 11, 153-176. [The activities of the ornithological station at Ottenby in 1951: In Swedish with English summary.]
14. Svärdson, G. 1953. Visible migration within Fennoscandia. Ibis 95, 181-211.
15. Edelstam, C. & Snellman, J. 1953. Vädrets betydelse för uppträdandet av sällsynta fågelgäster. 1: De fennoskandiska fynden av Lanius senator. Vår Fågelvärld 12, 8-22. (Felaktigt publicerad som no. 14.) [Rare vagrants and the weather situation. 1: The records of Lanius senator in Fennoskandia: In Swedish with English summary.]
16. Jenning, W. 1953. Verksamheten vid Ottenby fågelstation 1952. Vår Fågelvärld 12, 145-165. [The activities of the ornithological station at Ottenby in 1952: In Swedish with English summary.]
17. Jenning, W. 1954. Verksamheten vid Ottenby fågelstation 1953. Vår Fågelvärld 13, 53-76. [The activities of the ornithological station at Ottenby in 1953: In Swedish with English summary.]
18. Petersson, J, 1955. Acrocephalus agricola - en ny ostlig gäst vid Ottenby. Vår Fågelvärld 14, 153-154. [Acrocephalus agricola - a new eastern vagrant at Ottenby: In Swedish.]
19. Jenning, W. 1955. Verksamheten vid Ottenby fågelstation 1954. Vår Fågelvärld 14, 201-224. [The activities of the Ottenby Bird Station in 1954: In Swedish with English summary.]
20. Danielsson, B. 1956. Ett fall av omvänd flyttning i april 1955. Vår Fågelvärld 15, 54-56. [A case of reversed migration in April 1955: In Swedish with English summary.]
21. Jenning, W. 1956. Verksamheten vid Ottenby fågelstation 1955. Vår Fågelvärld 15, 151-176. [The activities of the Ottenby Bird Station in 1955: In Swedish with English summary.]
22. Danielsson, B. 1957. Verksamheten vid Ottenby fågelstation 1956. Vår Fågelvärld 16, 241-269. [The activities of the Ottenby Bird Station in 1956: In Swedish with English summary.]
23. Danielsson, B. 1958. Verksamheten vid Ottenby fågelstation 1957. Vår Fågelvärld 17, 177-201. [The activities of the Ottenby Bird Station in 1957: In Swedish with English summary.]
24. Martin-Löf, P. 1958. Storleksskillnader hos genomsträckande kärrsnäppor (Calidris alpina) vid Ottenby. Vår Fågelvärld 18, 249-279. [Size differences between early and late autumn passage-migrants od Calidris alpina at Ottenby: In Swedish with English summary.]
25. Danielsson, B. 1959. Verksamheten vid Ottenby fågelstation 1958. Vår Fågelvärld 18, 249-279. [The activities of the Ottenby Bird Station in 1958: In Swedish with English summary.]
26. Ramel, C. 1960. The influence of the wind on the migration of swallows. Proceedings XIIth International Ornithological Congress, Helsingfors, pp. 626-630.
27. Edberg, R. 1960. Fågelsträcket genom Kalmarsund 1958 och 1959. Vår Fågelvärld 19, 19-30. [The bird migration through the Kalmar Sound in 1958 and 1959: In Swedish with English summary.]
28. Tolstoy, A. 1960. Verksamheten vid Ottenby fågelstation 1959. Vår Fågelvärld 19, 292-315. [The activities of the Ottenby Bird Station in 1959: In Swedish with English summary.]
29. Edberg, R. 1961. Fågelsträcket genom Kalmarsund 1960. Vår Fågelvärld 20, 47-57. [The migration through the Kalmar Sound in 1960: In Swedish with English summary.]
30. Edberg, R. 1961. Två för Sverige nya fågelarter [brandkronad kungsfågel, alpjärnsparv] funna vid Ottenby 1959. Vår Fågelvärld 20, 111-114. [Two passerines new to Sweden trapped at Ottenby Bird Station: In Swedish with English summary.]
31. Myhrberg, H. 1961. Grönbenans (Tringa glareola) sträck genom Europa. Vår Fågelvärld 20, 115-145. [The migration of the Wood Sandpiper (Tringa glareola L.) through the Europe: In Swedish with English summary.]
32. Martin-Löf, P. 1961. Mortality rate calculations on ringed birds with special reference to the dunlin (Calidris alpina). Arkiv för Zoologi (Stockholm) Ser. 2 Bd 13, 483-491.
33. Tolstoy, A. 1961. Verksamheten vid Ottenby fågelstation 1960. Vår Fågelvärld 20, 318-330. [The activities of the Ottenby Bird Station in 1960: In Swedish with English summary.]
34. Edberg, R. 1962. Ökensångare (Sylvia n. nana [Hempr. & Ehrenb.]) vid Ottenby 1961. Vår Fågelvärld 21, 275-278. [The first record of the Desert Warbler (Sylvia n. nana) in Sweden: In Swedish with English summary.]
35. Öhman, C. G. 1962. Tajgasångare [Phylloscopus i. inornatus (Blyth)] anträffad vid Ottenby 1961. Vår Fågelvärld 21, 279-284. [The first record of the Yellow-browed Warbler (Phylloscopus i. Inornatus) in Sweden: In Swedish with English summary.]
36. Jenning, W. 1962. Långnäbbad beckasinsnäppa (Limnodromus scolopaceus, [Say]) anträffad i Sverige. Vår Fågelvärld 21, 285-291. [The first record of the Long-billed Dowitcher (Limnodromus scolopaceus) in Sweden: In Swedish with English summary.]
37. Mascher, J. W. 1963. Sträck och retursträck vid Ottenby våren 1962. Vår Fågelvärld 22, 37-44. [Some observations of northward and southward movements at the Otteby Bird Station in spring 1962: In Swedish with English summary.]
38. Schultz, R. von 1963. Vinter och vår vid Ottenby 1961/62. Vår Fågelvärld 22, 154-160. [The winter of 1961-62 at Ottenby: In Swedish with English summary.]
39. Svensson, S. 1964. Viktvariationer hos unga starar (Sturnus vulgaris). Vår Fågelvärld 23, 43-56. [Weight variations in young Starlings (Sturnus vulgaris): In Swedish with English summary.]
40. Gerell, R. & Svensson, S. 1962. Svarthuvad sparv (Emberiza melanocephala) på Öland. Vår Fågelvärld 21, 42-43. (Felaktigt publicerad som no. 34) [Third Swedish record of Emberiza melanocephala: In Swedish with English summary.]
41. Magnusson, B. 1963. Verksamheten vid Ottenby fågelstation 1961. Vår Fågelvärld 22, 145-153. (Felaktigt publicerad som no. 35) [The activities of the Ottenby Bird Station in 1961: In Swedish with English summary.]
42. Ljungdahl, P.-S. 1964. Videsångare (Phylloscopus schwarzi) anträffad i Sverige 1962. Vår Fågelvärld 23, 223-227. [The first record of Radde's Bushwarbler (Phylloscopus schwarzi) in Sweden: In Swedish with English summary.]
43. Tolstoy, A. 1965. Verksamheten vid Ottenby fågelstation 1962. Vår Fågelvärld 24, 144-155. [The activities of the Ottenby Bird Station in 1962: In Swedish with English summary.]
44. Edberg, R. 1965. Fågelsträcket genom Kalmarsund 1961. Vår Fågelvärld 24, 97-106. [Migration through the Kalmar Sound in 1961: In Swedish with English summary.]
45. Rydén, O. & Källander, H. 1964. Beräkning av ejderns (Somateria mollissima) sträckhastighet. Vår Fågelvärld 23, 151-158. (Felaktigt publicerad som no. 43) [Calculations of migratory flight speed with special reference to the Eider (Somateria molissima): In Swedish with English summary.]
46. Brinck, P., Svedmyr, A. & Zeipel, G. 1965. Migrating birds at Ottenby, Sweden, as carriers of ticks and possible transmitters of tickborne encephalitis virus. Oikos 16, 88-89.
47. Hjort, C. 1966. Korttålärkan (Calandrella cinerea), en för Sverige ny fågelart, påträffad vid Ottenby. Vår Fågelvärld 25, 37-39. [Firs record of the Short-toed Lark (Calandrella cinerea) for Sweden: In Swedish with English summary.]
48. Alnås, I. & Larsson, A. 1969. Verksamheten vid Ottenby fågelstation 1963 och 1964. Vår Fågelvärld 28, 9-17. [Activities of the Ottenby Bird Station in 1963 and 1964: In Swedish with English summary.]
49. Karlsson, L. 1969. Rostsparven Emberiza caesia en för Sverige ny fågelart anträffad vid Ottenby. Vår Fågelvärld 28, 252. [First record of Cretzschmar's Bunting Emberiza caesia in Sweden: In Swedish with English summary.]
50. Fahlander, B. 1969. Brunsångare Phylloscopus fuscatus anträffad vid Ottenby 1968. Vår Fågelvärld 28, 249-251. [First record of Dusky Warbler Phylloscopus fuscatus in Sweden: In Swedish with English summary.]
51. Svensson, L. 1969. Bestämningen av första fyndet av bergsångare Phyllsocopus bonelli och andra fyndet av videsångare Phyllsocopus schwarzi i Sverige. Vår Fågelvärld 28, 130-132. [The identification of the first record of Bonelli's Warbler Phyllsocopus bonelli and the second record of Radde's Bushwarbler Phyllsocopus schwarzi in Sweden: In Swedish with English summary.]
52. Svensson, L. 1970. Första fyndet av sydnäktergal i Sverige gällde östligaste rasen Luscinia megarhynchos hafizi (Sev.). Vår Fågelvärld 29, 67-71. [The first record of Nightingale in Sweden belonged to the easternmost subspecies Luscinia megarhynchos hafizi (Sev.): In Swedish with English summary.]
53. Edberg, R. 1971. Ottenby fågelstation 25 år. Vår Fågelvärld 30, 133-140. [Ottenby Bird Observatory 25 years old: In Swedish.]
54. Edelstam, C. & Lager, L. 1971. De svenska fynden av östliga gransångare Phylloscopus collybita tristis Blyth. Vår Fågelvärld 30, 238-239. [The Swedish records of Siberian Chiffchaffs Phylloscopus collybita tristis: In Swedish with English summary.]
55. Sandgren, L. 1971. Rödstrupig sångare Sylvia cantillans anträffad vid Ottenby. Vår Fågelvärld 30, 240-242. [The second record of Subalpine Warbler Sylvia cantillans in Sweden: In Swedish with English summary.]
56. Lindholm, C.-G., Luttrop, T. & Rodebrand, S. 1972. Verksamheten vid Ottenby fågelstation 1965-1970. Vår Fågelvärld 31, 117-128. [Activities of the Ottenby Bird Station in 1965 to 1970: In Swedish with English summary.]
57. Källander, H., Rydén, O. & Weikert, C. 1972. Unterschiede in der Beobachtungs-Effektivität bei Registrierung vom Küsten-See-vogelzug. Die Vogelwarte 26, 303-310. [Differences in the observation effectiveness by recording se sea-bird migration at the coast: In German with English summary.]
58. Edelstam, C. 1972. The visible migration of birds at Ottenby, Sweden. Vår Fågelvärld, suppl. 7, 360pp.
59. Rodebrand, S. 1972. Fågelsträcket genom Kalmarsund 1962 och 1963. Vår Fågelvärld 31, 247-251. [The migration through Kalmar Sound in 1962 and 1963: In Swedish with English summary.]
60. Cederwall, G. 1973. Sydnäktergal Luscinia m. megarhynchos vid Ottenby. Vår Fågelvärld 32, 43. [Third record of the Nightingale Luscinia m. megarhynchos in Sweden: In Swedish with English summary.]
61. Aulén, G. 1973. Korttålärka Calandrella cinerea vid Ottenby. Vår Fågelvärld 32, 43-44. [Short-toed Lark Calandrella cinerea at Ottenby, Öland: In Swedish with English summary.]
62. Cederwall, G. & Svenaeus, S. 1973. Vitstrupig näktergal Irania gutturalis anträffad i Sverige. Vår Fågelvärld 32, 128-130. [First record of White-throated Robin Irania gutturalis in Sweden: In Swedish with English summary.]
63. Hjort, C. & Larsson, A. 1973. Vadarinventering vid Ottenby 1965-1973. Vår Fågelvärld 32, 199-203. [Wader censuses at Ottenby 1965-1973: In Swedish with English summary.]
64. Svensson, L. 1973. Mindre härmsångare Hippolais caligata anträffad i Sverige. Vår Fågelvärld 32, 204-206. [First record of Booted Warbler Hippolais caligata in Sweden: In Swedish with English summary.]
65. Alexandersson, H. & Ingvarsson, L. 1974. Videsångare Phylloscopus schwarzi vid Ottenby. Vår Fågelvärld 33, 236. [Third record of Radde's Warbler Phylloscopus schwarzi in Sweden: In Swedish with English summary.]
66. Aulén, G. & Wahlström, K. 1974. Fågelsträcket genom Kalmarsund 1964-1967. Vår Fågelvärld 33, 286-292. [The migration through Kalmar Sound in 1964-1967: In Swedish with English summary.]
67. Hjort, C. 1976. The migration of Barnacle geese at Ottenby. Kumari, E. (ed.). Bird Migration. Academy of Sciences, Estonian SSR, Tallinn, pp. 165-174.
68. Shepard, J. M. 1976. Factors influencing female choice in the lek mating system of the Ruff. Living Bird 14, 87-111.
69. Mascher, J. & Marcström, V. 1976. Measures, weights, and lipid levels in migrating dunlins Calidris a. alpina L. at the Ottenby Bird Observatory, south Sweden. Ornis Scandinavica 7, 49-59.
70. Blomqvist, S. & Lindholm, C.-G. 1976. Fågelsträcket genom Kalmarsund 1968-1971. Vår Fågelvärld 35, 36-42. [The visible migration through Kalmar Sound during 1968 to 1971: In Swedish with English summary.]
71. Rodebrand, S. 1976. Fågelsträcket genom Kalmarsund 1972. Vår Fågelvärld 35, 126-129. [The visible migration through Kalmar Sound in 1972: In Swedish with English summary.]
72. Hjort, C. & Alerstam, T. 1976. Ett exempel på lavinsträck av gäss. Vår Fågelvärld 35, 185-194. [An example of an unusually strong passage of migrating geese: In Swedish with English summary.]
73. Svensson, S. 1978. Efficiency of two methods for monitoring bird population levels: breeding bird censuses contra counts of migrating birds. Oikos 30, 373-386.
74. Aulén, G. 1976. Förekomsten av höksångare Sylvia nisoria vid Ottenby 1971-1975. Calidris 5, 113-124. [The occurrence of Barred Warblers, Sylvia nisoria, at Ottenby, SE Sweden in 1971-1975: In Swedish with English summary.]
75. Almqvist, B. 1978. Flocksize in migrating eiders Somateria mollissima. Proc. Symp. Sea Ducks. Stockholm 1975, SNV PM 1009, pp. 123-131.
76. Hjort, C. 1977. Den vitkindade gåsens Branta leucopsis förekomst på Öland. Calidris 6, 59-71. [The occurrence of Barnacle Geese, Branta leucopsis, on Öland: In Swedish with English summary.]
77. Lindholm, C.-G. 1978. Talgoxens sträck över Östersjön höstarna 1975 och 1976. Anser, suppl 3, pp. 145-153. [The migration of the great tit Parus major across the Baltic Sea in the autumns of 1975 and 1976: In Swedish with English summary.]
78. Sandgren, B. 1978. Smutsgam Neophron percnopterus anträffad i Sverige. Vår Fågelvärld 37, 67-68. [First record of the Egyptian Vulture Neophron percnopterus in Sweden: In Swedish with English summary.]
79. Lindell, L., Walinder, G., Bengtsson, D. & Pettersson, J. 1978. Sibirisk järnsparv Prunella montanella anträffad i Sverige. Vår Fågelvärld 37, 69-72. [First record of the Siberian Accentor Prunella montanella in Sweden: In Swedish with English summary.]
80. Ingvarsson, L. 1978. Verksamheten vid Ottenby fågelstation 1971-1975. Vår Fågelvärld 37, 241-250. [Activities of Ottenby Bird Observatory 1971-1975: In Swedish with English summary.]
81. Pettersson, J. 1978. Mått på gråsiska Carduelis flammea vid Ottenby hösten 1972. Calidris 7, 3-11. [Measurements of Redpolls, Carduelis flammea, at Ottenby 1972: In Swedish with English summary.]
82. Hjort, C. & Lindholm, C.-G. 1978. Annual bird ringing totals and population fluctuations. Oikos 30, 387-392.
83. Pettersson, J., Österberg, J. & Kjellén, N. 1978. Långtåsnäppa Calidris subminuta funnen vid Ottenby - en ny art för Europa. Vår Fågelvärld 37, 333-338. [Long-toed Stint Calidris subminuta at Ottenby - a species new to Europe: In Swedish with English summary.]
84. Lindell, L. 1979. Cettisångare Cettia cettia anträffad i Sverige. Vår Fågelvärld 38, 91-94. [First record of Cetti's Warbler Cettia cettia in Sweden: In Swedish with English summary.]
85. Pettersson, J. 1981. Ejderns Somateria mollissima vår- och höststräck längs Ölands kuster. Proceedings 2nd Nordic Congress of Ornithology 1979, pp. 79-84. [The spring and autumn migration of Eiders Somateria mollissima along the coasts of Öland, southeast Sweden: In Swedish with English summary.]
86. Marcström, V. & Mascher, J. W. 1979. Weights and fat in Lapwings Vanellus vanellus and Oystercatchers Haematopus ostralegus starved to death during a cold spell in spring. Ornis Scandinavica. 10, 235-240.
87. Pettersson, J. 1979. Polyglottsångare Hippolais polyglotta för första gången anträffad i Sverige. Vår Fågelvärld 38, 245-246. [First record of the Melodious Warbler Hippolais polyglotta in Sweden: In Swedish with English summary.]
88. Pettersson, J. & Lindholm, C.-G. 1983. The sequential passage of different Robin Erithacus rubecula populations at Ottenby. Ornis Fennica, suppl. 3, pp. 34-36.
89. Lindholm, C.-G., Hjort, C. & Pettersson, J. 1983. Variations in the numbers of some migration passerines of Ottenby. Ornis Fennica, suppl. 3, pp. 92-93.
90. Pettersson, J. 1981. Ruggning och geografiskt ursprung hos talgoxar Parus major vid Ottenby. Vår Fågelvärld 40, 461-466. [Wing length, moult, and geographic origin of Great Tit Parus major at Ottenby: In Swedish with English summary.]
91. Hasselquist, D. 1981. Prutgåsens Branta bernicla förekomst på Öland. Calidris 10, 139-150. [The occurrence of the Brent Goose, Branta b. bernicla, on Öland: In Swedish with English summary.]
92. Knutsson, T. 1981. Svarta rödstjärten Phoenicurus ochruros på Öland. Calidris 10, 151-160. [The Black Redstart, Phoenicurus ochruros, on Öland: In Swedish with English summary.]
93. Lindström, Å. 1982. Fjällvråken (Buteo lagopus) vid Ottenby. Calidris 11, 121-134. [The Rough-legged Buzzard, Buteo lagopus, at Ottenby: In Swedish with English summary.]
94. Pettersson, J. 1983. Vårsträcket av olika ålders- och könskategorier av Rödhake Erithacus rubecula vid Ottenby. Proceedings 3rd Nordic Congress of Ornithology 1981, pp. 173-180. [Spring migration of different sex and age classes of Robin Erithacus rubecula at Ottenby: In Swedish with English summary.]
95. Larsson, A. 1982. Fågelfaunans sammansättning i ett tokområde inom Ottenby naturreservat. Calidris 11, 135-150. [Composition of the bird fauna in a Potentilla fruticosa-shrub vegetation at Ottenby, southern Öland: In Swedish with English summary.]
96. Pettersson, J. 1983. Rödhakens Erithacus rubecula höstflyttning vid Ottenby. Vår Fågelvärld 42, 333-342. [The autumn migration of the Robin, Erithacus rubecula, at Ottenby: In Swedish with English summary.]
97. Pettersson, G., Lindström, Å. & Ståhl, U. 1983. Sammetshätta Sylvia melanocephala för första gången anträffad i Sverige. Vår Fågelvärld 42, 251-252. [First record of Sardinian Warbler, Sylvia melanocephala, in Sweden: In Swedish with English summary.]
98. Hedenström, A. & Pettersson, J. 1984. Lövsångarens Phylloscopus trochilus flyttning vid Ottenby. Vår Fågelvärld 43, 217-228. [The migration of Willow Warbler, Phylloscopus trochilus, at Ottenby: In Swedish with English summary.]
99. Ellegren, H. & Pettersson, J. 1985. Gransångarens Phylloscopus collybita vårförekomst vid Ottenby. Calidris 14, 3-12. [The spring occurrence of Chiffchaff, Phylloscopus collybita, at Ottenby: In Swedish with English summary.]
100. Ellegren, H. Pettersson, J. 1983. Provencesångare Sylvia undata för första gången anträffad i Sverige. Vår Fågelvärld 42, 429-430. [First record of Dartford Warbler, Sylvia undata, in Sweden: In Swedish with English summary.]
101. Pettersson, J. 1986. Weight and fat levels in robins (Erithacus rubecula) wintering in northern Greece. Proceedings First Conference of Ornithology in the Mediterranean Region 1984, pp. 265-274.
102. Pettersson, J. & Hasselquist, D. 1985. Fat deposition and migration capacity of robins Erithacus rubecula and goldcrests Regylus regulus at Ottenby, Sweden. Ringing & Migration 6, 66-76.
103. Svensson, S. E. 1985. Effects of changes in tropical environments on the North European avifauna. Ornis Fennica 62, 56-63.
104. Pettersson, J. & Hedenström, A. 1986. Fluctuations in ringing figures of willow warblers at Ottenby, Sweden. Vår Fågelvärld, suppl. 11, 171-174.
105. Svensson, S., Hjort, C., Pettersson, J. & Roos, G. 1986. Bird population monitoring: a comparison between annual breeding and migration counts in Sweden. Vår Fågelvärld, suppl 11, 215-224.
106. Hedenström, A. & Pettersson, J. 1986. Differences in fat deposits and wing pointedness between male and female willow warblers caught on spring migration at Ottenby, SE Sweden. Ornis Scandinavica 17, 182-185.
107. Liljefors, M. 1986. Masktörnskata Lanius nubicus för första gången anträffad i Sverige. Vår Fågelvärld 45, 127-129. [First record of Masked Shrike, Lanius nubicus, in Sweden: In Swedish with English summary.]
108. Blomqvist, S., Frank, A. & Peteersson, L. R. 1987. Metals in liver and kidney tissues of autumn-migrating dunlin Calidris alpina and curlew sandpiper Calidris ferruginea staging at the Baltic Sea. Marine Ecology Progress Series 35, 1-13.
109. Hjort, C., Jansson, R. & Pettersson, J. The Ottenby ringing expedition to Cyprus 1985. The Birds of Cyprus, in press.
110. Hjort, C. & Pettersson, J. 1986. Ottenby fågelstation - 40 år på södra udden. Vår Fågelvärld 45, 189-200. [Ottenby Bird Observatory - 40 years at the southern point of Öland: In Swedish.]
111. Larsson, A. 1986. Effekter på fågelliv, vegetation och flora av slåtter och bränning på Schäferinängarna i Ottenby naturreservat. Calidris 15, 167-184. [Effects of hay-cutting and burning on bird fauna, vegetation and flora on meadows in Ottenby nature reserve, SE Sweden: In Swedish with English summary.]
112. Hedenström, A. & Pettersson, J. 1987. Migration routes and wintering areas of willow warblers Phylloscopus trochilus (L.) ringed in Fennoscandia. Ornis Fennica 64, 137-143.
113. Gezelius, L. & Hedenström, A. 1988. Vindens inverkan på fångsten av rödhakar Erithacus rubecula och kungsfågel Regulus regulus vid Ottenby. Vår Fågelvärld 47, 9-14. [Wind influence on the trapping figures of Robin, Erithacus rubecula, and Goldcrest, Regulus regulus, at Ottenby, Sweden: In Swedish with English summary.]
114. Sandberg, R., Pettersson, J. & Alerstam, T. 1988. Why do migrating robins Erithacus rubecula captured at two nearby stop-over sites orient differently? Animal Behaviour 36, 865-876.
115. Sandberg, R., Pettersson, J. & Alerstam, T. 1988. Shifted magnetic fields lead to deflections and bimodality in the migratory orientation of robin Erithacus rubecula at sunset. Animal Behaviour 36, 877-887.
116. Hansson, M. & Pettersson, J. 1989. Competition and fat deposition in goldcrests (Regulus regulus) at a migration stop-over site. Vogelwarte 35, 21-31.
117. Hasselquist, D., Hedenström, A., Lindström, Å. & Bensch, S. 1988. The seasonally divided flight feather moult in the barred warbler Sylvia nisoria - a new moult pattern for European passerines. Ornis Scandinavica 19, 280-286.
118. Pettersson, J. 1994. Ottenby fågelstation med det stora kärrsnäppematerialet. Calidris 23, 92-97. [Ottenby Bird Observatory with the extensive material on Dunlin Calidris alpina: In Swedish.]
119. Karlsson, L., Persson, K., Pettersson, J. & Walinder, G. 1988. Fat-weight relationships and migratory strategies in the robin Erithacus rubecula at two stop-over sites in south Sweden. Ringing & Migration 9, 160-168.
120. Engström, B. (red.) 1988. Ölands södra udde - klassisk fågelmark. Ottenby fågelstation, pp. 224. Uppsala. [The southern point of Öland - classical bird grounds: In Swedish.]
121. Ottosson, U., Johansson, K. & Pettersson, J. 1989. Häckfågelbestånden av and- och måsfåglar samt vadare på Ölands strandängar. Calidris 18, 47-87. [Breeding populations of ducks and gulls on meadows on Öland: In Swedish.]
122. Pettersson, J., Hjort, C., Lindström, Å. & Hedenström, A. 1990. Övervintrande rödhakar Erithacus rubecula kring Medelhavet och flyttande rödhakar vid Ottenby - en morfologisk jämförelse och analys av sträckbilden. Vår Fågelvärld 49, 267-278. [Wintering Robins, Erithacus rubecula, in the Mediterranean region and migrating Robins at Ottenby - a morphological comparison and an analysis of the migration pattern: In Swedish with English summary.]
123. Blomqvist, S. & Lindström, Å. 1992. Sweden - on the dividing line for spring migrating Siberian and Nearctic knots (Calidris canutus). Wader Study Group Bulletin 64(suppl.), 91-94.
124. Hedenström, A. & Lindström, Å. 1989. High body masses of migrating wrynecks Jynx torquilla in southern Sweden. Vogelwarte 35, 165-168.
125. Hjort, C. & Pettersson, J. 1990. Flyttfåglarnas antal och den föränderliga miljön. Calidris 19, 13-23. [Changing numbers of migrant birds versus changing environments: In Swedish with English summary.]
126. Pettersson, J., Sandberg, R. & Alerstam, T. 1991. Orientation of robins, Erithacus rubecula, in a vertical magnetic field. Animal Behavior 41, 533-536.
127. Åkesson, S., Karlsson, L., Pettersson, J. & Walinder, G. 1992. Body constituents and migration strategies; a comparison between robins Erithacus rubecula from two stop-over sites in Sweden. Vogelwarte 36, 188-195.
128. Sandberg, R. Ottosson, U. & Pettersson, J. 1991. Magnetic orientation of migratory wheatears (Oenanthe oenanthe) in Sweden and Greenland. Journal of Experimental Biology 155, 51-64.
129. VAKANT
130. Ottosson, U., Sandberg, R. & Pettersson, J. 1990. Orientation cage and release experiments with migratory wheatears (Oenanthe oenanthe) in Scandinavia and Greenland: The importance of visual cues. Ethology 86, 57-70.
131. Sandberg, R., Pettersson, J. & Persson, K. 1991. Migratory orientation of free-flying robins Erithacus rubecula and pied flycatchers Ficedula hypoleuca: release experiments. Ornis Scandinavica 22, 1-11.
132. Holmgren, N., Ellegren, H. & Pettersson, J. 1993. The adaptation of moult pattern in migratory dunlins Calidris alpina. Ornis Scandinavica 24, 31-27.
133. Hedenström, A. & Åkesson, S. 1991. Notes on the breeding biology of the barred warbler Sylvia nisoria at Ottenby, Sweden. Ornis Svecica 1, 57-59.
134. Holmgren, N., Ellegren, H. & Pettersson, J. 1993. Stopover length, body mass and fuel deposition rate in autumn migrating adult dunlins Calidris alpina evaluating the effects of moulting states and age. Ardea 81, 9-20.
135. Pettersson, J. 1991. Tranan - artens höstflyttning vid Ottenby. Calidris 20, 120-125. [The autumn migration of Crane Grus grus at Ottenby: In Swedish.]
136. Sandberg, R. 1994. Interaction of body condition and magnetic orientation in autumn migrating robins, Erithacus rubecula. Animal Behaviour 47, 679-686.
137. Ottosson, U. 1993. An observation of bateleur Terathopius ecaudatus in northern Tunisia. Bulletin of the British Ornithological Club 113, 62-63.
138. Hedenström , A., Bensch, S., Hasselquist, D., Lindström, Å., Pearson, D. & Åkesson, S. 1992. Split moult: stress or strategy? Ringing & Migration 13, 179-180.
139. Lindström, Å., Pearson, D. J., Hasselquist, D., Hedenström, A., Bensch, S. & Åkesson, S. 1993. The moult of barred warblers Sylvia nisoria in Kenya - evidence for a split wing-moult pattern initiated during the birds' first winter. Ibis 135, 403-409.
140. Pettersson, J. 1992. Staren - i holkarna på Ottenby. Calidris 21, 140-143. [The European Starling Sturnus vulgaris - in the nest-boxes at Ottenby: In Swedish.]
141. Pettersson, J. 1993. Ottenby fågelstation - verksamheten och ekonomi. Vår Fågelfauna, suppl 1, pp. 85-87. [Ottenby Bird Observatory - the activities and the economy: In Swedish.]
142. Pettersson, J. 1993. Populationsövervakning genom standardiserad fångst. Vår Fågelfauna, suppl. 1, pp. 13-16. [Standardized strapping as population monitoring: In Swedish.]
143. Håkansson, T. & Rhönnstad, P. 1993. Sydlig gransångare häckar på Öland. Calidris 22, 74-77. [Phylloscopus c. collybita - breeding on Öland: In Swedish with English summary.]
144. Pettersson, J. 1993. Blåhaken - en vårgäst på Öland i stigande antal. Calidris 22, 69-71. [The Bluethroat Luscinia svecica - an increasing spring migrant on Öland: In Swedish.]
145. Karlsson, L. & Pettersson, J. 1993. Ringmärkning och miljöövervakning - några jämförelser av fångstsummorna från Falsterbo och Ottenby fågelstationer. Vår Fågelvärld, suppl. 19, pp. 27-33. [Ringing and environmental monitoring - comparisons between ringing totals from Falsterbo and Ottenby Bird Observatories: In Swedish with English summary.]
146. Pettersson, J. 1993. En kornknarrs öde. Calidris 22, 140-144. [The destiny of a Corncrake Crex crex: In Swedish.]
147. Pettersson, J. 1993. Trädkryparen - flyttar över Östersjön. Calidris 22, 146-147. [The treecreeper - migrates across the Baltic Sea: In Swedish.]
148. Hjort, C. 1995. Gunnar Svärdson and the foundation of Ottenby Bird Observatory. Ornis Svecica 5, 49-54.
149. Blomqvist, S. & Lindström, Å. 1995. The spring migration of sanderling Calidris alba, little stint C. minuta and curlew sandpiper C. ferruginea in Sweden. Ornis Svecica 5, 55-67.
150. Hedenström, A., Lindsröm, Å. & Pettersson, J. 1995. Interrupted moult of adult willow warblers Phylloscopus trochilus during autumn migration through Sweden. Ornis Svecica 5, 69-74.
151. Lundgren, B., Hedenström, A. & Pettersson, J. 1995. Correlation between some body components and visible fat index in the willow warbler Phylloscopus trochilus (L.). Ornis Svecica 5: 75-79.
152. Åkesson, S., Hedenström, A., Hasselquist, D. 1995. Stopover and fat accumulation in passerine birds in autumn at Ottenby, southeastern Sweden. Ornis Svecica 5, 81-91.
153. Åkesson, S., Alerstam, T. & Hedenström, A. 1996. Flight inititation of nocturnal passerine migrants in relation to celestial orientation conditions at twilight. Journal of Avian Biology 27, 95-102.
154. Sandberg, R. & Pettersson, J. 1996. Magnetic orientation of snow buntings (Plectrophenax nivalis), a species breeding in the high arctic: Passage migration through temperate-zone areas. Journal of Experimental Biology 199, 1899-1905.
155. Bäckman, J., Pettersson, J. & Sandberg, R. 1997. The influence of fat stores on magnetic orientation in day-migrating Chaffinch, Fringilla coelebs. Ethology 103, 247-256.
156. Engström, B. 1996. Människor och fåglar - några minnesanteckningar av Boris Engström. Calidris 25, 57-66. [People and birds - some memoranda by Boris Engström: In Swedish.]
157. Amcoff, M. 1996. Prutgåsdagen - 14 oktober 1995. Calidris 25, 67-70. [The Brent Goose Branta b. bernicla day - October 14th 1995: In Swedish.]
158. Lindström, Å., Hedenström, A. & Pettersson, J. 1996. The autumn migration of willow warblers Phylloscopus trochilus in Sweden: results from a nationwide co-operative project. Ornis Svecica 6, 145-172.
159. Rhönnstad, P. 1996. Sommargyllingen i Ottenby lund. Calidris 25, 71-75. (Felaktigt publicerad som no. 158) [The Golden Oriole Oriolus oriolus in Ottenby lund: In Swedish.]
160. Hjort, C., Pettersson, J., Lindström, J. & King, M. B. 1996. Fuel deposition and potential flight ranges of blackcaps Sylvia atricapilla and whitethroats Sylvia communis on spring migration in The Gambia. Ornis Svecica 6, 137-144.
161. Ottvall, R. 1997. Vandrande mosaiksländan, Hemianax ephippiger, och vandrande ängstrollsländan, Sympetrum fonscolombei, funnen på södra Öland. Entomologisk Tidsskrift 118, 193-196. [The dragonflies Hemianax ephippiger and Sympetrum fonscolombei (Odonata: Aeshnidae and Libellulidae) found on the Baltic island of Öland: In Swedish with English summary.]
162. Engström, B. 1996. Människor och fåglar - några minnesanteckningar - del 2. Calidris 25, 117-129. [People and birds - some memoranda by Boris Engström - part two: In Swedish.]
163. Jonzén, N. & Pettersson, J. 1999. Autumn migration of raptors on Capri. Avocetta 23, 65-72.
164. Sandberg, R., Bäckman, J. & Ottosson, U. 1998. Orientation of snow buntings (Plectrophenax nivalis) close to the magnetic north pole. Journal of Experimental Biology 201, 1859-1870.
165. Ottvall, R. & Pettersson, J. 1998. Kornknarrens biotopval, ortstrohet och revirstorlek på Öland: en radiosändarstudie. Ornis Svecica 8, 65-76. [Habitat choice, home range size and site fidelity of the Corncrake Crex crex on Öland, Sweden: a radio telemetry study: In Swedish with English summary.]
166. Ottvall, R. & Pettersson, J. 1998. Is there a viable population of Corncrakes Crex crex on Öland, southeastern Sweden?: habitat preference in relation to hay-mowing activities. Ornis Svecica 8, 157-166.
167. Ottvall, R. 1999. Female corncrake singing in the wild. Journal für Ornithologie 140, 453-456.
168. Åkesson, S. & Hedenström, A. 2000. Wind selectivity of migratory flight departures in birds. Behavioural Ecology and Sociobiology 47, 140-144.
169. Waldenström, J. & Ottosson, U. 2000. The accuracy of field sex-determination in the common whitethroat Sylvia c. communis. Ornis Svecica 10, 67-70.
170. Waldenström, J. & Ottosson, U. 2002. Moult strategies in the common whitethroat Sylvia c. communis in Northern Nigeria. Ibis 144, E11-E18.
171. Bengtsson, D. & Jonzén, N. 2001. Höstflyttning av ängshök Circus pygargus och brun kärrhök C. aeruginosus på Ölands södra udde. Ornis Svecica 11, 1-6. [Autumn migration of Montagu's Harrier Circus pygargus and Marsh Harrier C. aeruginosus at the southern tip of Öland: In Swedish with English summary.]
172. Kvist, A. & Lindström, Å. 2001. Basal metabolic rate in migratory waders: intraindividual, intraspecific, interspecific and seasonal variation. Functional Ecology 15, 465-473.
173. Kvist, A. & Lindström, Å. 2003. Gluttony in migratory waders - unprecedented energy assimilation rates in vertebrates. Oikos 103, 397-402.
174. Wennerberg, L. & Burke, T. Low genetic differentiation between Curlew sandpiper (Calidris ferruginea) populations with highly divergent migratory directions shown by mitochondrial DNA and microsatellite analyses. Submitted.
175. Wennerberg, L. Holmgren, N. M. A. & Pettersson, J. Intraspecific variation in the timing of migration and moult in the annual cycle of the Dunlin Calidris alpina. Submitted.
176. Waldenström, J. & Bengtsson, D. 2001. A robin Erithacus rubecula found in juvenile plumage during spring migration. Ornis Svecica 11, 265-266.
177. Waldenström, J. Lindström, Å. 2001. Migration and morphometrics of the Broad-billed sandpiper Limicola falcinellus at Ottenby, southern Sweden, 1950-2000. Ornis Fennica 78, 184-192.
178. Waldenström, J., Broman, T., Carlsson, I., Hasselquist, D., Achterberg, R. P., Wagenaar, J. A. & Olsen, B. 2002. Prevalence of Campylobacter jejuni, Campylobacter lari, and Campylobacter coli in different ecological guilds and taxa of migrating birds. Applied and Environmental Microbiology, 68, 5911-5917.
179. Waldenström, J., Bensch, S, Kiboi, S, Hasselquist, D. & Ottosson, U. 2002. Cross-species infection of blood parasites between resident and migratory songbirds in Africa. Molecular Ecology 11, 1545-1554.
180. Jonzén, N., Hedenström, A., Hjort, C., Lindström, Å., Lundberg, P. & Andersson, A. 2002. Climate patterns and the stochastic dynamics of migratory birds. Oikos 97, 329-336.
181. Gustafsson, R., Hjort, C., Ottosson, U. & Hall, P. 2003. Birds at Lake Chad and in the Sahel of NE Nigeria 1997-2000. Special rept. Ottenby Bird Observatory.
182. Muheim, R., Bäckman, J. & Åkesson, S. 2002. Magnetic compass orientation in European robins is dependent on both wavelength and intensity of light. Journal of Experimental Biology 205, 3845-3856.
183. Ottosson, U. & Waldenström, J. 2003. Two cases of Common Whitethroats Sylvia communis with extra wing feathers among the secondaries. Ringing & Migration, 21: 154.
184. Blomqvist, S., Holmgren, N., Åkesson, S., Hedenström, A. & Pettersson, J. 2002. Indirect effects of lemming cycles on sandpiper dynamics: 50 years of counts from southern Sweden. Oecologia 133, 146-158.
185. Ottosson, U. & Waldenström, J. 2002. A Yellow-throated Leaf-Love (Chlorochicla flavicollis) with extra wing feathers among the primaries. Afring News 31:24-25.
186. Green, M., Blomqvist, S. & Lindström, Å. 2003. The spring migration of two Bar-tailed Godwit Limosa lapponica populations in Sweden. Ornis Svecica 13, 1-15.
187. Hedenström, A. & Rosén, M. 2003. Body frontal area in passerine birds. Journal of Avian Biology 34, 159-162
188. Hernandez, J., Bonnedahl, J., Waldenström, J., Palmgren, H. & Olsen, B. 2003. Salmonella in birds migrating through Sweden. Emerging Infectious Diseases 9, 753-754.
189. Ottosson, U., Bairlein, F. & Hjort, C. 2002. Migration patterns of Palaearctic Acrocephalus and Sylvia warblers in north-eastern Nigeria. Vogelwarte 41, 249-262.
190. Niskanen, T., Waldenström, J., Fredriksson-Ahomaa, M. Olsen, B., & Korkeala, H. virF-Positive Yersinia pseudotuberculosis and Yersinia enterocolitica found in migratory birds in Sweden. Applied and Environmental Microbiology 69, 4670-4675.

Appendix 3.
Björn Olsen (PhD, Adjoint Professor and MD)
University of Umeå and Kalmar County Hospital
Zoonotic research at Ottenby Bird Observatory
e-mail: bjorn.olsen@infdis.umu.se
phone: +46 480 81000

Jonas Waldenström (PhD student)
University of Lund
Zoonotic research at Ottenby Bird Observatory
e-mail: jonas.waldenstrom@zooekol.lu.se
phone: +46 46 2223172

Martin Stervander
Warden Ottenby Bird Observatory
e-mail: ottenby@post.utfors.se
phone: +46 485 661093
fax: +46 485 661322

Åke Lindström (PhD, Associate Professor)
University of Lund
Chairman of Ottenby Bird Observatory
e-mail: ake.lindstrom@zooekol.lu.se
phone: +46 46 2224968

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